[metapost] Troubles rendeting text in PNG output

[Akira Kakuto]

Dear Luigi,

I've confirmed that "abracadabra" is truncated
even in the following example.
Therefore it may not be a latex issue.
The cases with other outputformat than "png" are OK.

verbatimtex
\font\xxx=cmr17
etex

outputformat := "png";
outputtemplate := "%j-%c.%o";
prologues:=3;
beginfig(1);
label(btex $(hs,f(s)t)$ etex, (0,0));
label(btex \xxx abracadabra etex, (0,-20));
endfig;
end.

Best regards,
Akira